Telephone system



E. P. G. WRIGHT TELEPHQNE SYSTEM Filed Nov. 12 1930 Aug. 30, 1932.

2 Sheets-Sheet l lNi/ENTOR E. P; e, WRIGHT 6? @W fiTTORNEV r 1932- v I IE. Pie. WRIGHT Q 1,874,684

TELEPHONE SYSTEM Filed NOV. 12, 193.0- 2 Sheets-Sheet 2 lNi/ENTOR E. P. G. WRIGHT A TTORNEV Patented Aug. 30, 1932 nsivronn PHI LIP swims wtieHn-jtt;.imwy ngtqmo niyenanp,iessrenon 'ro wnsrnnn nrnc'rarc coryrransz, rncoaronarnn; or nn'w YORK, 2.; "a conrona.

TION on NE Yon'x 5 This invention relates to telephone systems employing register senders in theestablishment of connections and has for its object to combine speed of operation with' 'economy of equipment in such a systenL-r In telephone areas employing a number of code digits, 'snch as threeg it hitherto been the practiceeither ('1 to employ an A? digit selector which in response tolthevfirst and searched: in groups of ten; by the" -z.A?

digit selector'common theret'ol. 'lhe' quantity 5 required for this -arrangementis'approximately 50% greater than the number which wouldbe necessary if all theregis'ter translators could be maintained inone group; gs

On the other hand there is some'disadvantage which arises in the use-of threedigit register senders because their holding time is increased not only. for the receiptiof= an extra digitbut for thelper'iod of time :which must ielapsebetween the commencement of dialing 1 i Again the three digit; register senders are open to 1 the criticism? that 5 all the" exchange names must appear on theicodeswitch-or translator and consequently it the-capacity of the code switch is smaller than the-largest possible combination of exchange names-,it is necessary to provide an arrangement which will he-sufiiciently flexible to permit new exchanges tobe added from time to time without difficulty. 1 7'. :1;

v The object of the present invention is' to combine the use ofU-x? digit selectors with register senders chosen in large groups. This arrangement is made possible in the embodiment to be described by the use of a single If .rnrinriionnjs'rsrnig j code digit selects 0118;0f ajgi-o'u'p be register The o jectio'n to'thejformrinethod is ,1 T the register' senders-which arelpalrticularly I 1 'expensive'are divided aipintoz'eight groups isender in Patent l,7 .7,44l6,- granted to. E. P, G.

motion switch forithefAdigit-selector. the said-embodiment, insteadof dividing- :the bank of the v A digit selector. intol'vnine groups, it'is divided into threegroups and therefore each; group .is capable of having .33 choice's'insteadof ll %choices.': This increase of accessibility; enables the quantity{ ofregister senders .to be considerably reduced 5 I-f onefof the groups 0f registers senders has to carry considerablymore trafli thanith'e othersl,;the number fQ outlets. ion. itheebanki 'of sthe .fA digiti's'witchs fonil h g oup: (would bet in,- creasedqat the, expense-lot ,the. ether} groupsz dccording totheimainifeatureofi the invenioh thecr gistercsenders are: groupediionaa -'n0n decima11basis. I iI k'th=p1TB. 8l3rQ Z I. &ngQ .mentt each ?g :Q11?p. oti egistertsendersmillibe a cessibl trin iespon ei oth ee?9 d gi sdnd the A .di it-i sel ctorewilh bena p edito E f breea signals to th n will t, f turesqo i h fi ventionlwill be apparent fromii h .t li ow ng description of ,the preferred-- embodiment .and ;will;b e set ,out in'the appended'claimsav g :1 Inthe accompanying: drawings," Fig. 1. illustrates-the:fundamental portions of an -FA digit -c.selector using .single; motion switches. Fig. 2shows that portion of a register sender in which the. registration ismade and-the .translation.efi'ected, -i )l The, flA-fl digit selector s be ;by meansof a;link,circuit overja trunkcin cuit in a manner similar to the selection of a :85 gwright let-alw, :May; 6, 1930 F or ,in the: manner described iniBritish Patent al.9413580, accepted '--.March 15,1923, Assuming-thatga link-circuit isrused; the link circuit 101 will. extend the .subscribersline 100 to a trunk circuit ter i- 59}? 'nating in a first code selector withrwhich is associated an idle Af digit selector as indicated by. battery connectcdtoterminal 102 over the inner right back contact of relay 103 and the outer right back-contact of relaylOi. .When-the trunk circuit is .found,irclay 107 isroperated to render thedigit selector individual to the trunk. Relay 107 also prepares thecircuit'b'y which the first code selector and subsequent switches are controlled. Bela-3 outer right back contact the testing circuitand prepares at its outer left-front .contact the the i1npulsing ,inagnet 115. Whentlie' first series of impulses arrives the magnet is stepped through the-left contact of relay 109, outer left frontco'n'tact of relay; 1Q4C inding @of relay-130, back; con

tact of relay 106 to ground. Relay 130 is of the slow releasing type 'and-does not release during the train'ofimpulses; I The operation of relay= :130 closes a circuit for 'themagnet 127 whichrroperates" through its interrupter springs, wiper 124, its homeposition and frontcontact of relay 130 toground The bank terminals swept over; by the Wiper 114: bf the switch lm' are cross-connected to the bank terminalsswept over 'by' the Wiper 1-21 of theswitch in such a Way that Whi Ie the w iper 114: is in position 1, 2; 3 or 4a ground -potential, 'conneeted to' the iviper o verithe rightbacheontact'otre1ay 109, is extended-to position l of the -s'witclr 120; ,-WheI 8aS the terminals' '5, '5 and 7'iaf'e multipled to: the first terminal c onne'cted to t he 'second 'i'gro'up of registefsenders iterminals8," 9 and 10 are nrulti "led to the first terminaU connectedto the," th1rd group ot-register senders. I f Asfalread y e'ipl 'n'edthemagnet 127 takes one step when the relay operates,but in pbs'iti orr il a circuit will'be close'd for relay 131 through t hie left ba'cllr fcontactiof relay' l0 3, Wiper 121-f-theWiper--114; right back contact of relay 109 to ground-L} If the digit dialed :is greater than 4' [the circuit 1 for relay 131 'will be bpened when switch 110 moves from positon es'ito position 52 "A circ'uitjwill'be "completedfo'r magnet 127 through its int'erru'pte'r springs, Wiper 12ft, back contact of relay 131, 0uter back contactofrelay=103', to ground. The switch-120 will, therefore continue stepping "until relay 131 reoper'ates at the commencement of the'secondfgroup;

31? A circuit' 'isprepared for'th'e' relay 109 whichis i dependent put the back contact ot relay 130=,-ront contact of 131, outer back'contact of may 10s: The back comet *o'f relay 103 'ivill be closed when the relay 130 rele'a's'es' at thfendf of the train' o'f i1n- "pulses andthe'front contact-bf relay 131'W-ill 'beclosed only When the Wiper-121 is standing 'jo'n a bank terminal corresponding to that uponfiwhich" the wiper 114 is standing. gl-lence, the relay 109 Will operate only when the s'Witch 120is standing atthe commence- 'me nt=0f the; group indicated by the digit dialed; "Relay 109 locks over its left Winding audits left front contact to ground on the test 5 WlIGOVBI terminal 102. Relay 109 at its left back contact opens the circuit of the magnet 115, at its inner right front contact closes a circuit for the testing relay 103 and at its right back contact opens the circuit of relay 131 and places ground potential on the last terminals of thegroupsjinrthebank ofiswitch 120 to Which Wiper 121has access so that if all the senders in the groups are engaged, relay 131 will operate when thesyvitc h 127 .rea.c l l s A; free register senderis chara ter a battery potential onthe test terminal' 128 which will Cause the operation of relay 103 WJJiQhJ Qk hr i n in s and left front contact to ground at the inner right contact of relay 109; At-its middle ri'ght back con-tacti relay, 103, opens the circuit of I relay 106'in the Aitdigitselector andeXtends-the pulse circuit, controlled by. relay. ;10,51 to relay 230 in the register, sender. wAtfits-outerright back contact relay F103 opens; the ,.drixiing;circuit of .themagnet 127 and prevents it from taking any further steps. {Relay 230 operates in the pulse circuit in turn-operatingrelay234 fithelast s'et .offtern ina'ls.

which substitutes: ground-. -for-, b ttery-.j0n

terminal 128. holding relay 10.3 10 cked through .itS11eft-Wii1dingaJ; "n n l;;.= ia;:a'1,;';;ij P1? The; bank terminal s'gswept' oyjer; by thesw-ip ersi' .112 and i113 are- {connected ;to ;battery, and earth r'esp ectivelyjin Various positions so that ifthe digit 2 5 501: 8 iss-dial ed; batteryawillibe 'foundeb'y; wiperj 112zalonegmvhelteaszfife/the digits 3;! 6*.015 9 :be dialed iground; willabfe; (5on1- nected to wiper.- 1 13} alone fiend-if,- the digits, 7 or 0 be; fdia'ledyzthei wiper} 1'12,:wi ll ,be 5 connected to battery the wiperiil13zto ground. :TllBSGg signals will be passed: over the-inner "ri'ghtwand l'eft'front contacts. of,':relay:104 and Wipers 122 and. 123 :to the. relaysr231 andF23'2 in the register translator through theinner and outer :right back.dontactsrespectivelyof relay 2*33. .;-Relay 231' if :operated Will' lock up through its. right front contact and the outer left 1 front contact :1 of I nrelay." 234 to ground, and relay 232 will lo'ck'o er'rthealeft front contact of: relay 232 :to" battery at 'the inner :left front contact of relay 234w Relay 230'in the register sender in; response to the first series of impulses operates the vertical magnet 211 through} the normal b'ank't'erniinal and'wip er;203 of the digit distributing switch 200; winding "of-"relay 235, i nner right front contact of {relay 23 1, back contact of relay 230to ground causing the switch ;represented by brush 213 to lift its wipersa number 'of steps corresponding to the number of impulsesdialedi Relays 234Leand 235 are of the slow to release type andremain operated during'the'trainof impulses; A circuit is closed for the magnet 204 of the digitdistributor "throughthe' outer right frontQcontact of relay 234: and the front contact of relay 235, causing the magnet to takeone step when the relay 235 releases. Thesecond set of impulses is repeate'd't'o the rotary magspring net2l2 through the first bank terminal and wiper 203 of digit distributor 200 thereby rotating switch 210 to a position corresponding to the second digit'and at-the conclusion of this train of impulses the" switch 200 advances to position 2. Inthe same way the thousands, hundreds, tens" and-units digits are stored by means of registers (not shown), the switch 200 advancing'onestep foreach set of impulses. When the'vertical 'magnet 21 11ope'rated switch 210 one step theofi' normal springs 214 were closed, thus'comp'leting a circuit for the magnet 224 of the code switch or translator 220, through its interrupter t, left back contact of relay 236, oilnormal springs 214:, back contact of relay 237 to {ground The translator switch 220 continues stepping until a circuit is completed for relay '236"through wiper 223,,cohtacts of relays231 or 232m groundat the outer' left baclrcontact of relay 2331' In this way the code switch or translator 220 is positioned at the'commencement of the: group indicated by h the relays 231' and 232mm first terminal of fonegroup is marked when the relayi23l is time, thefirst ermin -io f the' s ep d r-0111 1 when both relays and 232'are 'opeiatedifl'and the first terminal 6f the thi'r'd isrqup sim kd he th l' y 25 0 operated? flhe operation",'of*the'relay';23

e fisuie circuit of the magnet'aarw- 'Iieache's p osition'2 indicating that thei s witch 21 0h as been positionedfa for relay- 233 through its leanermal contacts,

'r sit rel tf on ac of rel y 3. 1. n iterfmin'als andwiper' 202 tozgroundfi Ren'yess fopens circuit of'r elay 23"6 4at'1 its outer. left back contact but proyidesfailo c lting "for itself at its i'nner left contact to' ground over wiper 202. Relay 236, tliereforeg'eleases and recloses the circuit for the" inagnet 224 which steps forward until the p'er 223 reachesthe bank terminal which is jumpere'd jvia'the crossfco'nnecting field. 238 tothebank terminal on which wiper 2l3 is positioned.

new 236'then 'reoperatesfrom battery, windi o ay 2 by y w te :1223 c 2'13. Should the-code digits dialednotcorrespond to any oilice, a jumper will be arranged on the cross-connecting field to introdu'ce the relay 237 which will open the stepping circuit of the magnet 224c'at its back contact. v

It should be understood that the sending from the register sender may be performed in any-of a number of ways well known to those skilled 1n the art. The translated code digits will. be obtained over other wipers of 'theswitch 220 and other apparatus which is ltion 5.

I 2. In a dial telephonesystem, a plurality or register senders arranged in groups. on a ndn-decimal basis, means to select one of saidsendlars, means'rto operate 'said selectingmeans-inresponse to the first code digit of a telephone designation, means to record the remaining code digits in said'sender and meansin 1 said sender for makinga translationbased onalloihsaid codeidigitsj: 1*

'3; Ina dial telephoneisystem, a plurality of register senders arranged in groups on: a

non-decimal basis, means I to select": one of said senders, means to -operate said select- "lng means 1n"- response to the first 1 code digit of a I telephone: "designationf and means in said s'ele'ctin'g means to transmit a discriminating signal to; said sender; v "4,fln a ;dial'-telephoi1e system a plurality fofii'egis'ter senders arrangedzin lgroups' on:a non=decimalbasis; means; "comprising 1 a single motior'r selectomswitch lfor selectingan idle sender in one of; said groups, 'and 'means 'tb operate "said selectorin a'ccordance with "the first c'ode 0 telphoneidesigna' r, I.

*In afdial teleph .-;:plur lity o regi'st'er" senders :divided i nto i groups, selecting-mean responsive to :the 1 first: digit d'ialed for selecting an idle sen'der :in one of said groups, said selecting means being; so

arranged 'that' th'e number of senders in one grou can; be i increased 1 at" the 1 exp ense of another-"group orgroupsx I -6.@=In dial telephone s st m p i y of "register senders arrangeds 1n groups 0n a non-decimal basis, means t'o'select' one of saidsenders,'-mean s to operate said selecting "means in {respon'se'to the first' code digit of a telephone designatiommeans inwsaid'selectfling means to transmit a; discriminating :sig- 'nal to' said 'sender means to record the re --maini'ng"= co'de digits in said 2 sender, and means -in sai'd sender for making :ai translationbased on said ="discriminating "signals'iin combination with saidremaining code digits 57; In a dial telephone system, a'plurality of register senders 'arrangedflingroups on a non-decimal basis, means-to select one of said senders and means to cause said selecting means to hunt over the same group of senders in response'to the reception of a plurality of different first "code digits of telephone designations.

8. In a dial telephone syste1n ,'.a' plurality of register senders arranged" inthree groups ioo corresponding toithreegroups of, first code digits, meansto'select one of said groupsio-t senders and means toioperateisaid selecting means responsive to the reception of anyone I? .of-the digits mom of said three groups of digits to select an idle sender in the corresponding'group of senders.v v -9. In a dial telephone system, a plurality of register'senders arranged in three groups corresponding to three groups of first code digits, means responsive to the reception of any;one-.-of-the digits in one'of said three groups ':'to. mark the corresponding group of senders, selecting means and means to cause said selectingmeans to select anidle sender in'themarkedgroupj '10. In a dialtelephone system, a plurality of register senders arranged in three groups corresponding tothree.groups of first code digits, a.-marking switch, -means responsive to the reception; of any one of thedigits in oneof said three groups to cause said markingiswitch to, mark the corresponding group of senders, a vselecting-switch, and means 'to cau'sesa-id selecting switch to select'an ,idle

sender in the marked group: n; 5;: 113511.111; a dial telephone system, .a plurality. of; register}. senders Iarranged in three groups igcorresponding to three groups of rfirst. a code 2 digits,- a :markingswitch,- means arespon'sive to the reception of i any: one i of ithie r digits in: one ofi-said. three groups to cause's'aid: marking; switch to mark the corresponding group of senders, a selecting switch; gandnmeans' .to; cause :said selecting switch; to select an? idle sender, inthe marked "group, .-:a'nd1 means ''insaid marking switch to 'transmiti a discriminating signal to I said senders w' 4 -1 12. In a1 telephone system, plurality ofiregister senders arranged-in three groups corresponding to three groups of first code digitspa marking switch, means responsiye tothe:receptionofiany oneof the digits in 1- v one of said three groups to cause said marking switch to m-arkthecorresponding group of senders, a selecting switch, means to cause said selecting switch .to select an idle sender in the marked group, conductors connecting i v59 said marking switch with-said register senders and meansin said marking switch to connect a characteristic potential to one -or more ofianpluralit'y of said conductors to operate discriminating means in said sendery 13. In a dial telephone system, a plurality of'register senders arranged in threegroups corresponding to -three groups of first code digits, a marking switch, means responsive tot'he reception-of anyone of the digits in one C7 of said three groups to cause said marking switch to markthecorresponding group 01 senders, a selecting switch, means to cause said selecting switch to select an idle sender in the marked group, conductors connecting said marking ,switchwith saidregister senders, means-in said marking switch to connect-a'ch'aracteristic potential to one-or more of a pluralityofsaid conductors and a group of relays-inf said sender responsive to=said characteristic potential. v 4

{14%. In adial telephone system, a plurality of register senders arranged in three groups corresponding to three groups of first code digits, a marking switch, means tooperate said marking switch in responseto a first code-digit, means in said marking switch;responsive to the reception ofiany one ofthe digits intone of said three groups to mark-the corresponding group of senders, a: selecting switch,-means to cause said selecting switch to select an -idle sender in the markedigroup {and a group-of relays in said sender selectively operable in vaccordance withthef individual position of said marking switch, l5. In adial telephone system, a;plu ality of register senders arranged :in three groups corresponding to three groups, of first lcode digits, a markingswitch having .a plurality of wipers, a selecting switch having a plurality of-wipers, means responsive to thereception of, anyone of .the.digits vin ,zone of said three groups" toQmark ,the corresponding group of senders, means to. cause said selecting switch to .:select an idle sender in the marked group, -apa ir oi'relaysin -said sender and means in said marking switch to: cqiinect ,a characteristic potential ,to; one or the 'other ,org pt fof a p imf e. W Pers ij aidi ark- ;i gswitch andsai d selecting switch to operate one .or the, other, orhoth of said relays Q j 16,; a dial telephone system, a plurality otregister senders arranged in three'groups corresponding to three groupsof first code digits, a marking switch having a plurality pfwipe'rs, a selecting switch having a plurality of wipers, means responsiiretdthe reception of any one of the digits in one ot said three groups to mark the corresponding .group 0f senders, means vto cause said selecting switch to select an idle sender in the marked group, 'a pair ofrelays in said sender, means in said marking switch to connect a characteristic potentialto one or the other-orvboth ofa pair of the wipers of said'marking switch .and said selecting switch to operate one or the otheror both of said relays, a translator switch and means under the control ofsaid relays to control the setting of said translator switch; 2 v

1 7. In a dial telephone system, ajplurality of register senders arranged in three groups corresponding to three groups of first code digits, a marking switch having a plurality of wipers, a selecting switch having a plurality of wipers, means responsive to the reception of any one of the digits in one of said three groups to mark the corresponding group of senders, means to cause said selecting switch to select an idle sender in the marked group,

a pair of relays'in said sender, means in said marking switch to connect a characteristic potential to one or the other or both of a pair of the wipers of said marking switch and said selecting switch to operate one or the other or both of said relays, a translator switch and means to give said translator switch a preliminary setting in accordance with the operation of said relays.

18. In a telephone system, an A digit selector comprising a selecting switch and a marking switch, three sets of multipled contacts in a level of the marking switch, marking conductors from said sets to three groups of tel minals in the bank of the selecting switch, three groups of register senders accessible from the said selecting switch, B and G digit registering means in each register sender, discriminating means in each register sender adapted to be variably operated in accordance with the setting of said marking switch within any one of said sets of multipled contacts and translating means in each register sender adapted to be set in accordance with the setting of the B and C digit registering means and the said discriminating means.

19. In a telephone system, a plurality of register senders divided into groups, means responsive to a digit of the wanted designation to select an idle register sender, said selecting means being efiective to select an idle register sender in a particular group in response to digits of two or more values and means to subsequently transmit to said selected register sender a discriminating signalindicative of the value of the particular digit dialed.

In witness whereof, I hereunto subscribe my name this 21st day of October, 1930.

ESMOND PHILIP GOODWIN WRIGHT. 

